21024208 has 20 divisors (see below), whose sum is σ = 42506208. Its totient is φ = 10054880.

The previous prime is 21024197. The next prime is 21024209. The reversal of 21024208 is 80242012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28198 + ... + 28933.

Almost surely, 2^21024208 is an apocalyptic number.

It is an amenable number.

21024208 is an abundant number, since it is smaller than the sum of its proper divisors (21482000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024208 is a wasteful number, since it uses less digits than its factorization.

21024208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57162 (or 57156 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 21024208 is about 4585.2162435375. The cubic root of 21024208 is about 275.9983896846.

The spelling of 21024208 in words is "twenty-one million, twenty-four thousand, two hundred eight".